Can't be bothered to get your payment card out of your wallet or purse? Pay with a sticker on the back of your mobile instead, says Barclaycard.

Barclaycard is tapping into the growing near-field communications (NFC) payments market with its PayTag system that allows you to "pay with your mobile phone".

In this case though, there is no system integration with the phone itself. At a third of the size of a normal card, the stick-on credit card is simply stuck to the back of any mobile phone.

Once attached, it can be used to make payments of £15 and under, rising to £20 in June, when held over a contactless payment terminal.

David Chan, CEO of Barclaycard Consumer Europe, said: “Most of us say that the item we’re most lost without is our mobile phone, so we’re giving people the option of using them to make easy, convenient, everyday payments without the need to upgrade their current handset.”

Visa predicts that the number of contactless point-of-sale terminals in the UK will rise by 50 percent to 150,000 this year. Major retailers that offer, or are introducing, contactless payments include Waitrose, McDonalds, Boots, WH Smith and Tesco. By the end of 2012, London buses will also accept contactless payments, followed by the Tube and the rest of the transport network in the capital in 2013.

An "exclusive group of customers" will be invited to receive their Barclaycard PayTag in the coming weeks, before they are offered to millions of Barclaycard customers later in the year.

Earlier in the year Barclaycard owner Barclays Bank launched a mobile payments service to rival the PayPal system.

PayPal allows registered users to make payments over the internet by simply using an email address linked to their banking details. The new Barclays service - called Pingit - allows users to make payments using their mobile number linked to their current account.